Refcount browser process in BaseLoginDisplayHost so message loop does not exit

chrome/browser/chromeos/login/base_login_display_host.cc

Index: chrome/browser/chromeos/login/base_login_display_host.cc
diff --git a/chrome/browser/chromeos/login/base_login_display_host.cc b/chrome/browser/chromeos/login/base_login_display_host.cc
index ce8a9f7a89edb62716234d2bee970215ee53ff87..90f5a59a07e64925149c1abcb115075239cdcdb7 100644
--- a/chrome/browser/chromeos/login/base_login_display_host.cc
+++ b/chrome/browser/chromeos/login/base_login_display_host.cc
@@ -90,9 +90,19 @@ BaseLoginDisplayHost::BaseLoginDisplayHost(const gfx::Rect& background_bounds)
       NotificationService::AllSources());
   DCHECK(default_host_ == NULL);
   default_host_ = this;
+
+  // Add a reference count so the message loop won't exit when other
+  // message loop clients (e.g. menus) do.
+  g_browser_process->AddRefModule();
 }
 
 BaseLoginDisplayHost::~BaseLoginDisplayHost() {
+  // A browser should already exist when destructor is called since
+  // deletion is scheduled with MessageLoop::DeleteSoon() from
+  // OnSessionStart(), so the browser will already have incremented
+  // the reference count.
+  g_browser_process->ReleaseModule();
+
   default_host_ = NULL;
 }